Using Maxim Rytin's delightful Mathematica
notebook "Champernowne
Constant and Its Continued Fraction Expansion" to calculate cf3[\[Xi]\_7],
Mathematica 4 derives 13522 terms in under 15 hours on a 300 MHz G3 with 768
MB RAM. An attempt to calculate cf3[\[Xi]\_8] resulted, fairly early in the
computation, in an "overflow occurred" error. Here then, replacing
the three largest terms by W, X, and Y, is the calculated
expansion: